* {
    margin: 0;
    padding: 0;
}

.big {
    width: 100%;
    height: 100vh;
    background-color: black;
}

.top {
    width: 100%;
    height: 8vh;
    display: flex;
    align-items: center;
}

.topimg {
    width: 25px;
    height: 25px;
    background-color: #ffffff;
    border-radius: 100%;
    display: flex;
    position: absolute;
    justify-content: center;
    align-items: center;
    margin-left: 15px;
    /* 添加旋转属性 */
    transform: rotate(180deg);
}    

.top div img {
    width: 35%;
    height: 35%;
    transform: rotate(180deg);
}

.top span {
    text-align: center;
    font-size: 13px;
    color: #ffffff;
}

.canvas {
    width: 100%;
    height: 92vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

.white {
    width: 35vh;
    height: 35vh;
    display: flex;
    color: #3c8ce6;
    justify-content: center;
    align-items: center;
    white-space: nowrap;
    font-size: 13px;
    flex-direction: column;
    background-color: #ffffff;
}

.yarddiv {
    width: 21vh;
    height: 21vh;
    margin-top: 10px;
    border: 1px #dcdcdc solid;
    /* 添加以下样式使内部元素居中 */
    display: flex;
    justify-content: center;
    align-items: center;
}

.qrcode {
    width: 160px;
    height: 160px;
    /* margin-top: 15px; */
}    